Move clear cache code from chrome/ (ChromeWVGDelegate) to extensions/ (WVGuest)
  since browsing_data/ is now under components/

BUG=471287
Test=None, internal only change without visible side effects.

Review URL: https://codereview.chromium.org/1056793002

Cr-Commit-Position: refs/heads/master@{#326985}
diff --git a/extensions/extensions.gyp b/extensions/extensions.gyp
index 4c12f71c..a0578394 100644
--- a/extensions/extensions.gyp
+++ b/extensions/extensions.gyp
@@ -124,6 +124,7 @@
       'dependencies': [
         '../base/base.gyp:base',
         '../base/base.gyp:base_prefs',
+        '../components/components.gyp:browsing_data',
         '../components/components.gyp:device_event_log_component',
         '../components/components.gyp:keyed_service_content',
         '../components/components.gyp:keyed_service_core',